\documentclass[12pt]{article} 
 \textheight15cm \textwidth6cm \parindent0mm \parskip 1ex plus2ex minus0.8ex
\begin{document}
\newsavebox{\weather}
\savebox{\weather}[2.5cm]{raining}
It is \usebox{\weather} and \usebox{\weather} and \usebox{\weather} and \ldots.
\end{document}